As I might have mentioned before, I have a friend who owns and operates a
dance studio. We barter services, I get dance classes for my daughter and
she gets me for editing all of the music and other audio and directing sound
and lights at the recital.

When I mix the music tracks, I master it twice. There is a "recital mixdown"
which needs to be as high quality as possible for the show, so I use FLAC
there. But the files are huge, so I send the teachers a "rehearsal mixdown"
which is in MP3 format and about one-fifth of the size.